error[E0502]: cannot borrow `t0` as mutable because `*t0` is also borrowed as immutable
  --> $DIR/borrowck-swap-mut-base-ptr.rs:13:15
   |
LL |     let p: &isize = &*t0;     // Freezes `*t0`
   |                      --- immutable borrow occurs here
LL |     swap(&mut t0, &mut t1);
   |               ^^ mutable borrow occurs here
...
LL | }
   | - immutable borrow ends here

error: aborting due to previous error

For more information about this error, try `rustc --explain E0502`.